Fluval "U" Poly/Carbon Cartridges

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  • Designed to fit U2, U3, and U4 Underwater Filters
  • Polyester side filters out fine debris and contaminants for crystal clear water
  • Carbon side filters out harmful liquid substances, discolorations and odors
  • Porous surface of both sides provides an environment for beneficial bacteria to carry out natural biological filtration
  • Custom fit to prevent water bypass and improve filtration efficiency
  • For freshwater, saltwater, or reptile environments

The Fluval U Poly/Carbon Cartridges feature two sides for effective mechanical and chemical filtration. These filter cartridges are secifically designed for Fluval U2, U3, and U4 Underwater Filters.


  • Rinse thoroughly before use.
  • Replace every 2 - 4 weeks, or when flow rate is noticeably reduced.
  • Only replace one cartridge at a time. NEVER replace both cartridges at the same time. By replacing one at a time, you will maintain a healthy level of beneficial bacteria (which is very important for filtration).
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